/* ========================================
   线条小狗风格 - 800天浪漫纪念网站
   Cute Pastel Dog Theme
   ======================================== */

/* CSS变量 - 可爱柔和配色 */
:root {
    /* 主色调 - 柔和天蓝 */
    --sky-light: #E8F4F8;
    --sky-main: #B5E2EA;
    --sky-deep: #7FCAD8;
    --sky-accent: #5BB5C5;
    
    /* 辅助色 - 柔和粉色 */
    --pink-light: #FFE4EC;
    --pink-main: #FFB6C8;
    --pink-deep: #FF8FA3;
    --pink-heart: #FF6B8A;
    
    /* 奶油色/米色 */
    --cream: #FFF9F0;
    --cream-dark: #F5EBD8;
    --warm-white: #FFFCF7;
    
    /* 小狗颜色 */
    --dog-white: #FEFEFE;
    --dog-brown: #D4A574;
    --dog-brown-dark: #B8956A;
    --dog-nose: #3D3D3D;
    
    /* 草地绿 */
    --grass-light: #C5E8B7;
    --grass-main: #9ED68C;
    --grass-dark: #7BC469;
    
    /* 星星月亮 */
    --star-yellow: #FFE566;
    --moon-cream: #FFF7CC;
    
    /* 文字色 */
    --text-dark: #4A4A4A;
    --text-medium: #6B6B6B;
    --text-light: #8B8B8B;
    
    /* 字体 */
    --font-cute: 'ZCOOL KuaiLe', 'Comic Sans MS', cursive;
    --font-body: 'ZCOOL XiaoWei', 'Microsoft YaHei', sans-serif;
    --font-handwritten: 'Ma Shan Zheng', cursive;
}

/* 引入可爱字体 */
@import url('https://fonts.googleapis.com/css2?family=ZCOOL+KuaiLe&family=ZCOOL+XiaoWei&family=Ma+Shan+Zheng&display=swap');

/* 全局重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    /* 移动端优化 */
    -webkit-text-size-adjust: 100%;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: var(--font-body);
    background: var(--sky-light);
    color: var(--text-dark);
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.8;
    /* 移动端优化 */
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    touch-action: pan-y; /* 允许垂直滚动，优化触摸体验 */
}

/* 可爱背景图案 */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 10% 20%, rgba(255, 182, 200, 0.3) 0%, transparent 30%),
        radial-gradient(circle at 90% 80%, rgba(181, 226, 234, 0.4) 0%, transparent 30%),
        radial-gradient(circle at 50% 50%, rgba(197, 232, 183, 0.2) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

/* 格子背景图案 */
body::after {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(rgba(181, 226, 234, 0.3) 1px, transparent 1px),
        linear-gradient(90deg, rgba(181, 226, 234, 0.3) 1px, transparent 1px);
    background-size: 30px 30px;
    pointer-events: none;
    z-index: 0;
    opacity: 0.5;
}

/* ========================================
   可爱小狗装饰
   ======================================== */
.cute-dog {
    position: fixed;
    font-size: 60px;
    z-index: 1;
    animation: dogFloat 4s ease-in-out infinite;
    filter: drop-shadow(2px 4px 6px rgba(0,0,0,0.1));
}

.cute-dog.dog-1 {
    bottom: 20px;
    left: 20px;
    animation-delay: 0s;
}

.cute-dog.dog-2 {
    bottom: 20px;
    right: 20px;
    animation-delay: 2s;
}

@keyframes dogFloat {
    0%, 100% { transform: translateY(0) rotate(-5deg); }
    50% { transform: translateY(-15px) rotate(5deg); }
}

/* ========================================
   粒子效果 - 星星和爱心
   ======================================== */
#particles-container,
#hearts-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
    overflow: hidden;
}

.particle {
    position: absolute;
    font-size: 16px;
    animation: starFloat linear infinite;
    opacity: 0.8;
}

@keyframes starFloat {
    0% {
        transform: translateY(-20px) rotate(0deg);
        opacity: 0;
    }
    10% { opacity: 0.8; }
    90% { opacity: 0.8; }
    100% {
        transform: translateY(100vh) rotate(360deg);
        opacity: 0;
    }
}

.floating-heart {
    position: absolute;
    font-size: 24px;
    animation: heartBounce ease-out forwards;
    pointer-events: none;
}

@keyframes heartBounce {
    0% {
        transform: translateY(0) scale(0.5);
        opacity: 1;
    }
    50% {
        transform: translateY(-100px) scale(1.2);
        opacity: 0.8;
    }
    100% {
        transform: translateY(-200px) scale(0.8);
        opacity: 0;
    }
}

/* ========================================
   开场信封动画 - 可爱版
   ======================================== */
#opening-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(180deg, var(--sky-light) 0%, var(--sky-main) 50%, var(--grass-light) 100%);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    transition: opacity 1s ease, visibility 1s ease;
}

/* 云朵装饰 */
#opening-overlay::before {
    content: '☁️';
    position: absolute;
    top: 10%;
    left: 10%;
    font-size: 80px;
    opacity: 0.6;
    animation: cloudFloat 6s ease-in-out infinite;
}

#opening-overlay::after {
    content: '☁️';
    position: absolute;
    top: 15%;
    right: 15%;
    font-size: 60px;
    opacity: 0.5;
    animation: cloudFloat 8s ease-in-out infinite reverse;
}

@keyframes cloudFloat {
    0%, 100% { transform: translateX(0); }
    50% { transform: translateX(30px); }
}

#opening-overlay.fade-out {
    opacity: 0;
    visibility: hidden;
}

.envelope-container {
    text-align: center;
    cursor: pointer;
    z-index: 5; /* 信封在底层，但高于背景 */
    position: fixed; /* 固定定位，保持在底部 */
    bottom: 80px;
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
}

/* 可爱信封 */
.envelope {
    position: relative;
    width: 300px;
    height: 200px;
    margin: 0 auto;
    margin-top: 0; /* 移除固定margin-top，使用flex居中 */
    perspective: 1500px;
    background: url('letteropening.gif') center center / cover no-repeat;
    border-radius: 20px;
    border: 4px solid white;
    overflow: visible;
}

.envelope-body {
    position: absolute;
    width: 100%;
    height: 100%;
    background: transparent;
    border-radius: 20px;
    box-shadow: 
        0 15px 40px rgba(255, 107, 138, 0.3),
        inset 0 0 30px rgba(255, 255, 255, 0.5);
    overflow: visible;
    border: none;
    z-index: 1;
}

.envelope-body::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 40px;
    opacity: 0.5;
    z-index: 2;
}

.envelope-flap {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 110px;
    background: transparent;
    clip-path: polygon(0 0, 50% 100%, 100% 0);
    transform-origin: top center;
    transition: transform 0.8s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    z-index: 5;
    border-top: 4px solid white;
    border-left: 4px solid white;
    border-right: 4px solid white;
    box-sizing: border-box;
}

.envelope.open .envelope-flap {
    transform: rotateX(180deg);
    z-index: 0;
}

/* 可爱信件 - 独立居中显示 */
.letter {
    position: fixed; /* 独立定位，不依赖信封 */
    top: 50%; /* 屏幕中央 */
    left: 50%;
    transform: translateX(-50%) translateY(-50%); /* 居中显示 */
    width: 600px;
    max-width: 85vw;
    height: auto;
    max-height: calc(100vh - 350px); /* 桌面端：确保信件底部在信封顶部之上（信封底部80px + 高度200px + 边距70px） */
    background: #FFFFFF;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    transition: opacity 0.8s ease 0.3s, transform 0.8s cubic-bezier(0.68, -0.55, 0.265, 1.55) 0.3s;
    z-index: 20; /* 确保信件在信封上方 */
    overflow-y: auto;
    border: 5px solid var(--pink-main);
    opacity: 0;
    pointer-events: none;
}

/* 信纸装饰线 - 非常淡 */
.letter::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        /* 信纸横线 */
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 38px,
            rgba(255, 182, 200, 0.12) 38px,
            rgba(255, 182, 200, 0.12) 39px
        ),
        /* 背景水印图案 - 柔和渐变 */
        radial-gradient(circle at 20% 30%, rgba(255, 182, 200, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(181, 226, 234, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 50% 50%, rgba(255, 229, 102, 0.05) 0%, transparent 60%),
        /* 纸张纹理效果 */
        repeating-linear-gradient(
            45deg,
            transparent,
            transparent 2px,
            rgba(255, 255, 255, 0.03) 2px,
            rgba(255, 255, 255, 0.03) 4px
        );
    pointer-events: none;
    border-radius: 20px;
}

/* 信件背景装饰元素 - 可爱图案 */
.letter::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        /* 左上角装饰 */
        radial-gradient(circle at 8% 8%, rgba(255, 107, 138, 0.15) 0%, rgba(255, 107, 138, 0.15) 3%, transparent 3%),
        /* 右上角装饰 */
        radial-gradient(circle at 92% 8%, rgba(181, 226, 234, 0.15) 0%, rgba(181, 226, 234, 0.15) 3%, transparent 3%),
        /* 左下角装饰 */
        radial-gradient(circle at 8% 92%, rgba(255, 229, 102, 0.15) 0%, rgba(255, 229, 102, 0.15) 3%, transparent 3%),
        /* 右下角装饰 */
        radial-gradient(circle at 92% 92%, rgba(255, 182, 200, 0.15) 0%, rgba(255, 182, 200, 0.15) 3%, transparent 3%),
        /* 中间装饰点 */
        radial-gradient(circle at 50% 30%, rgba(255, 107, 138, 0.08) 0%, rgba(255, 107, 138, 0.08) 2%, transparent 2%),
        radial-gradient(circle at 30% 60%, rgba(181, 226, 234, 0.08) 0%, rgba(181, 226, 234, 0.08) 2%, transparent 2%),
        radial-gradient(circle at 70% 60%, rgba(255, 229, 102, 0.08) 0%, rgba(255, 229, 102, 0.08) 2%, transparent 2%),
        /* 边框装饰线 */
        linear-gradient(90deg, transparent 0%, rgba(255, 182, 200, 0.2) 10%, transparent 20%),
        linear-gradient(0deg, transparent 0%, rgba(181, 226, 234, 0.2) 10%, transparent 20%);
    background-size: 
        40px 40px, 40px 40px, 40px 40px, 40px 40px,
        30px 30px, 30px 30px, 30px 30px,
        100% 2px, 2px 100%;
    background-position: 
        0 0, 100% 0, 0 100%, 100% 100%,
        50% 30%, 30% 60%, 70% 60%,
        0 0, 0 0;
    background-repeat: no-repeat;
    pointer-events: none;
    z-index: 0;
    border-radius: 20px;
}

.envelope.open ~ .letter,
.letter.show {
    opacity: 1;
    pointer-events: auto;
    transform: translateX(-50%) translateY(-50%) scale(1); /* 居中显示并放大 */
}

.letter-content {
    padding: 40px 50px;
    position: relative;
    z-index: 1;
    background: #FFFFFF;
}

/* 信件内容区域的装饰 - 四个角落 */
.letter-content::before {
    content: '💕';
    position: absolute;
    top: 15px;
    left: 15px;
    font-size: 32px;
    opacity: 0.25;
    animation: floatHeart 3s ease-in-out infinite;
    z-index: 0;
    filter: drop-shadow(0 2px 4px rgba(255, 107, 138, 0.3));
}

.letter-content::after {
    content: '💖';
    position: absolute;
    bottom: 15px;
    right: 15px;
    font-size: 30px;
    opacity: 0.25;
    animation: floatHeart 3s ease-in-out infinite 1.5s;
    z-index: 0;
    filter: drop-shadow(0 2px 4px rgba(255, 107, 138, 0.3));
}

/* 添加另外两个角落的装饰 */
.letter-text::before {
    content: '✨';
    position: absolute;
    top: 15px;
    right: 15px;
    font-size: 28px;
    opacity: 0.25;
    animation: floatHeart 3s ease-in-out infinite 0.75s;
    z-index: 0;
    filter: drop-shadow(0 2px 4px rgba(255, 229, 102, 0.3));
}

.letter-text::after {
    content: '🌸';
    position: absolute;
    bottom: 15px;
    left: 15px;
    font-size: 28px;
    opacity: 0.25;
    animation: floatHeart 3s ease-in-out infinite 2.25s;
    z-index: 0;
    filter: drop-shadow(0 2px 4px rgba(181, 226, 234, 0.3));
}

@keyframes floatHeart {
    0%, 100% { 
        transform: translateY(0) rotate(0deg);
        opacity: 0.2;
    }
    50% { 
        transform: translateY(-10px) rotate(10deg);
        opacity: 0.3;
    }
}

/* 信件边框装饰 */
.letter {
    background: 
        linear-gradient(#FFFFFF, #FFFFFF) padding-box,
        linear-gradient(135deg, var(--pink-light), var(--sky-light), var(--pink-main), var(--star-yellow)) border-box;
    border: 5px solid transparent;
    /* position 已在上面定义，不重复设置 */
}

.letter::before {
    border-radius: 20px;
}

/* 添加角落装饰 */
.letter-content::before,
.letter-content::after {
    pointer-events: none;
}

.letter-content h2 {
    font-family: var(--font-cute);
    font-size: 36px;
    color: #E91E63;
    text-align: center;
    margin-bottom: 15px;
}

.letter-date {
    text-align: center;
    font-size: 18px;
    color: #888;
    margin-bottom: 25px;
    font-family: var(--font-cute);
}

.letter-text {
    font-family: var(--font-body);
    font-size: 20px;
    line-height: 2.2;
    color: #222;
    position: relative;
}

.letter-text p {
    margin-bottom: 16px;
}

.letter-text .highlight {
    color: #E91E63;
    font-size: 42px;
    font-weight: bold;
    background: linear-gradient(180deg, transparent 50%, rgba(255, 229, 102, 0.6) 50%);
    padding: 0 6px;
}

.letter-text .love-declaration {
    color: #C41E3A;
    font-weight: bold;
    padding: 12px 18px;
    background: rgba(255, 182, 200, 0.5);
    border-radius: 12px;
    display: block;
    margin: 16px 0;
    font-size: 18px;
}

.letter-text .signature {
    text-align: right;
    margin-top: 25px;
    color: #666;
    font-style: italic;
    font-size: 18px;
}

.click-hint {
    margin-top: 30px;
    font-family: var(--font-cute);
    font-size: 18px;
    color: #666;
    animation: bounce 2s ease infinite;
    padding: 0 20px;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

/* ========================================
   主内容区
   ======================================== */
#main-content {
    position: relative;
    z-index: 2;
}

#main-content.hidden {
    display: none;
}

/* ========================================
   可爱导航栏
   ======================================== */
#navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 12px 40px;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    border-bottom: 3px solid var(--pink-light);
    box-shadow: 0 4px 20px rgba(255, 182, 200, 0.3);
}

#navbar ul {
    display: flex;
    list-style: none;
    gap: 30px;
}

#navbar .nav-link {
    font-family: var(--font-cute);
    font-size: 16px;
    color: var(--text-dark);
    text-decoration: none;
    padding: 8px 20px;
    border-radius: 25px;
    transition: all 0.3s ease;
    background: transparent;
    border: 2px solid transparent;
}

#navbar .nav-link:hover,
#navbar .nav-link.active {
    background: var(--pink-light);
    color: var(--pink-heart);
    border-color: var(--pink-main);
    transform: scale(1.05);
}

.music-btn {
    position: absolute;
    right: 40px;
    background: var(--sky-light);
    border: 3px solid var(--sky-main);
    color: var(--sky-accent);
    padding: 8px 18px;
    border-radius: 25px;
    cursor: pointer;
    font-size: 18px;
    transition: all 0.3s ease;
}

.music-btn:hover {
    background: var(--sky-main);
    transform: scale(1.1);
}

.music-btn.playing {
    animation: musicWiggle 0.5s ease infinite;
    background: var(--pink-light);
    border-color: var(--pink-main);
}

@keyframes musicWiggle {
    0%, 100% { transform: rotate(-5deg); }
    50% { transform: rotate(5deg); }
}

/* ========================================
   首页区域 - 可爱版
   ======================================== */
#hero {
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 100px 20px;
    position: relative;
    background: linear-gradient(180deg, var(--sky-light) 0%, var(--sky-main) 70%, var(--grass-light) 100%);
}

/* 草地 */
#hero::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 150px;
    background: 
        radial-gradient(ellipse at 20% 100%, var(--grass-main) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 100%, var(--grass-main) 0%, transparent 50%),
        linear-gradient(0deg, var(--grass-light) 0%, transparent 100%);
}

.hero-content {
    text-align: center;
    z-index: 1;
    max-width: 800px;
}

/* 800天徽章 - 可爱版 */
.anniversary-badge {
    display: inline-block;
    padding: 20px 50px;
    background: linear-gradient(135deg, var(--star-yellow), var(--moon-cream));
    border-radius: 50px;
    margin-bottom: 25px;
    box-shadow: 
        0 8px 30px rgba(255, 229, 102, 0.5),
        inset 0 -4px 0 rgba(0,0,0,0.1);
    animation: badgeBounce 3s ease-in-out infinite;
    border: 4px solid white;
    cursor: pointer;
}

@keyframes badgeBounce {
    0%, 100% { transform: translateY(0) rotate(-2deg); }
    50% { transform: translateY(-15px) rotate(2deg); }
}

.badge-text {
    display: block;
    font-family: var(--font-cute);
    font-size: 52px;
    color: var(--pink-heart);
    line-height: 1;
    text-shadow: 2px 2px 0 white;
}

.badge-subtitle {
    font-family: var(--font-cute);
    font-size: 16px;
    color: var(--text-medium);
    letter-spacing: 3px;
}

.main-title {
    margin-bottom: 15px;
}

.title-line {
    display: block;
    font-family: var(--font-cute);
    font-size: 56px;
    color: var(--pink-heart);
    text-shadow: 
        3px 3px 0 white,
        -1px -1px 0 var(--pink-light);
    letter-spacing: 8px;
}

.date-display {
    font-family: var(--font-cute);
    font-size: 32px;
    color: var(--sky-accent);
    margin-bottom: 30px;
    letter-spacing: 4px;
    background: white;
    display: inline-block;
    padding: 10px 30px;
    border-radius: 30px;
    border: 3px solid var(--sky-main);
}

/* 计时器 - 可爱版 */
.countdown-section {
    margin: 30px 0;
}

.countdown-label {
    font-family: var(--font-cute);
    font-size: 20px;
    color: var(--text-medium);
    margin-bottom: 15px;
}

.countdown-numbers {
    display: flex;
    justify-content: center;
    gap: 15px;
}

.count-item {
    background: white;
    border: 4px solid var(--pink-main);
    border-radius: 20px;
    padding: 15px 20px;
    min-width: 90px;
    box-shadow: 0 6px 0 var(--pink-light);
    transition: transform 0.3s ease;
}

.count-item:hover {
    transform: translateY(-5px);
}

.count-item span:first-child {
    display: block;
    font-family: var(--font-cute);
    font-size: 42px;
    color: var(--pink-heart);
    line-height: 1;
}

.count-label {
    font-family: var(--font-cute);
    font-size: 14px;
    color: var(--text-medium);
    margin-top: 5px;
}

/* 节日祝福卡片 - 可爱版 */
.holiday-wishes {
    display: flex;
    justify-content: center;
    gap: 25px;
    margin: 35px 0;
}

.wish-card {
    background: white;
    border: 3px solid var(--sky-main);
    border-radius: 20px;
    padding: 20px 30px;
    display: flex;
    align-items: center;
    gap: 12px;
    transition: all 0.3s ease;
    box-shadow: 0 5px 0 var(--sky-light);
}

.wish-card:hover {
    transform: translateY(-8px) rotate(-2deg);
    box-shadow: 0 12px 20px rgba(91, 181, 197, 0.3);
}

.wish-icon {
    font-size: 45px;
}

.wish-text {
    font-family: var(--font-cute);
    font-size: 22px;
    color: var(--text-dark);
}

.wish-card.christmas {
    border-color: var(--grass-main);
    box-shadow: 0 5px 0 var(--grass-light);
}

.wish-card.newyear {
    border-color: var(--star-yellow);
    box-shadow: 0 5px 0 var(--moon-cream);
}

/* 滚动提示 */
.scroll-hint {
    display: inline-block;
    margin-top: 40px;
    color: var(--text-medium);
    text-decoration: none;
    font-family: var(--font-cute);
    transition: all 0.3s ease;
}

.scroll-hint:hover {
    color: var(--pink-heart);
}

.scroll-arrow {
    width: 25px;
    height: 25px;
    margin: 12px auto 0;
    border-right: 4px solid var(--pink-main);
    border-bottom: 4px solid var(--pink-main);
    transform: rotate(45deg);
    animation: arrowBounce 2s ease infinite;
}

@keyframes arrowBounce {
    0%, 100% { transform: rotate(45deg) translateY(0); }
    50% { transform: rotate(45deg) translateY(10px); }
}

/* ========================================
   回忆相册区域 - 动态幻灯片
   ======================================== */
#memories {
    padding: 80px 20px;
    background: linear-gradient(180deg, var(--grass-light) 0%, var(--sky-light) 30%, var(--cream) 100%);
    position: relative;
    overflow: hidden;
}

.section-header {
    text-align: center;
    margin-bottom: 40px;
}

.section-title {
    font-family: var(--font-cute);
    font-size: 42px;
    color: var(--pink-heart);
    margin-bottom: 10px;
    text-shadow: 2px 2px 0 white;
}

.section-subtitle {
    font-family: var(--font-cute);
    font-size: 18px;
    color: var(--text-medium);
}

/* 幻灯片控制按钮 */
.slideshow-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 30px;
    margin-bottom: 30px;
}

.control-btn {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    border: 4px solid var(--pink-main);
    background: white;
    color: var(--pink-heart);
    font-size: 24px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 5px 0 var(--pink-light);
}

.control-btn:hover {
    background: var(--pink-main);
    color: white;
    transform: translateY(-3px);
}

.control-btn:active {
    transform: translateY(2px);
    box-shadow: 0 2px 0 var(--pink-light);
}

.slideshow-info {
    text-align: center;
}

#photo-counter {
    font-family: var(--font-cute);
    font-size: 20px;
    color: var(--text-dark);
    display: block;
    margin-bottom: 8px;
}

.autoplay-btn {
    background: var(--sky-light);
    border: 3px solid var(--sky-main);
    border-radius: 25px;
    padding: 8px 20px;
    font-family: var(--font-cute);
    font-size: 14px;
    color: var(--sky-accent);
    cursor: pointer;
    transition: all 0.3s ease;
}

.autoplay-btn:hover {
    background: var(--sky-main);
    color: white;
}

.autoplay-btn.playing {
    background: var(--pink-light);
    border-color: var(--pink-main);
    color: var(--pink-heart);
    animation: playingPulse 2s ease infinite;
}

@keyframes playingPulse {
    0%, 100% { box-shadow: 0 0 10px rgba(255, 107, 138, 0.3); }
    50% { box-shadow: 0 0 25px rgba(255, 107, 138, 0.6); }
}

/* 主照片展示区 */
.main-slideshow {
    max-width: 900px;
    margin: 0 auto;
}

.slideshow-container {
    position: relative;
}

.photo-frame {
    position: relative;
    background: white;
    border: 8px solid white;
    border-radius: 30px;
    overflow: hidden;
    box-shadow: 
        0 20px 60px rgba(255, 107, 138, 0.3),
        0 10px 0 var(--pink-light);
    transition: all 0.5s ease;
}

.photo-frame:hover {
    transform: scale(1.02);
    box-shadow: 
        0 30px 80px rgba(255, 107, 138, 0.4),
        0 15px 0 var(--pink-main);
}

.photo-frame img {
    width: 100%;
    height: 500px;
    object-fit: contain;
    display: block;
    transition: all 0.3s ease;
    background: linear-gradient(135deg, #FFE4E1 0%, #FFF0F5 100%);
}

/* 照片切换动画 */
.photo-frame img.fade-out {
    opacity: 0;
    transform: scale(0.95);
}

.photo-frame img.fade-in {
    opacity: 1;
    transform: scale(1);
}

/* 照片字幕覆盖层 */
.photo-caption-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.7) 0%, rgba(0, 0, 0, 0.5) 50%, transparent 100%);
    color: white;
    padding: 20px 25px 25px 25px;
    font-family: var(--font-elegant);
    font-size: 18px;
    line-height: 1.6;
    text-align: center;
    z-index: 15;
    backdrop-filter: blur(2px);
    transition: all 0.3s ease;
}

.photo-frame:hover .photo-caption-overlay {
    background: linear-gradient(to top, rgba(0, 0, 0, 0.8) 0%, rgba(0, 0, 0, 0.6) 50%, transparent 100%);
}

/* 照片装饰角 */
.photo-decoration {
    position: absolute;
    font-size: 30px;
    animation: decorationFloat 3s ease-in-out infinite;
    z-index: 10;
}

.photo-decoration.top-left {
    top: 15px;
    left: 15px;
}

.photo-decoration.top-right {
    top: 15px;
    right: 15px;
    animation-delay: 0.5s;
}

.photo-decoration.bottom-left {
    bottom: 15px;
    left: 15px;
    animation-delay: 1s;
}

.photo-decoration.bottom-right {
    bottom: 15px;
    right: 15px;
    animation-delay: 1.5s;
}

@keyframes decorationFloat {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-8px) rotate(10deg); }
}

/* 照片说明 */
.photo-caption-display {
    text-align: center;
    margin-top: 25px;
}

.day-badge {
    display: inline-block;
    background: linear-gradient(135deg, var(--star-yellow), var(--moon-cream));
    color: var(--text-dark);
    font-family: var(--font-cute);
    font-size: 22px;
    padding: 10px 30px;
    border-radius: 30px;
    border: 4px solid white;
    box-shadow: 0 5px 20px rgba(255, 229, 102, 0.4);
    margin-bottom: 15px;
}

#photo-message {
    font-family: var(--font-cute);
    font-size: 20px;
    color: var(--text-dark);
    margin: 0;
}

/* 缩略图滚动条 */
.thumbnail-strip {
    margin-top: 40px;
    padding: 20px 0;
    overflow: hidden;
}

.thumbnail-container {
    display: flex;
    gap: 15px;
    animation: thumbnailScroll 60s linear infinite;
    width: max-content;
}

.thumbnail-container:hover {
    animation-play-state: paused;
}

@keyframes thumbnailScroll {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

.thumbnail {
    width: 100px;
    height: 100px;
    border-radius: 15px;
    overflow: hidden;
    border: 4px solid white;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    cursor: pointer;
    transition: all 0.3s ease;
    flex-shrink: 0;
}

.thumbnail:hover {
    transform: scale(1.15) rotate(-3deg);
    border-color: var(--pink-main);
    box-shadow: 0 8px 25px rgba(255, 107, 138, 0.3);
    z-index: 10;
}

.thumbnail.active {
    border-color: var(--pink-heart);
    box-shadow: 0 0 20px rgba(255, 107, 138, 0.5);
}

.thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    background: linear-gradient(135deg, #FFE4E1 0%, #FFF0F5 100%);
}

/* 里程碑快速导航 */
.milestone-quick-nav {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 30px;
    padding: 20px;
    background: white;
    border-radius: 25px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    box-shadow: 0 5px 0 var(--pink-light);
}

.nav-label {
    font-family: var(--font-cute);
    font-size: 16px;
    color: var(--text-medium);
}

.milestone-btn {
    background: var(--sky-light);
    border: 3px solid var(--sky-main);
    border-radius: 20px;
    padding: 8px 18px;
    font-family: var(--font-cute);
    font-size: 14px;
    color: var(--text-dark);
    cursor: pointer;
    transition: all 0.3s ease;
}

.milestone-btn:hover {
    background: var(--pink-light);
    border-color: var(--pink-main);
    transform: translateY(-3px);
}

/* 浮动照片效果 */
.floating-photos-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    overflow: hidden;
    z-index: 0;
}

.floating-photo {
    position: absolute;
    width: 80px;
    height: 80px;
    border-radius: 15px;
    border: 3px solid white;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.15);
    opacity: 0.6;
    animation: floatAround 20s ease-in-out infinite;
}

.floating-photo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 12px;
}

@keyframes floatAround {
    0%, 100% {
        transform: translateY(0) rotate(0deg);
    }
    25% {
        transform: translateY(-30px) rotate(5deg);
    }
    50% {
        transform: translateY(0) rotate(0deg);
    }
    75% {
        transform: translateY(-20px) rotate(-5deg);
    }
}


/* 秘密消息区域 */
.secret-section {
    padding: 60px 20px;
    background: linear-gradient(180deg, var(--cream) 0%, var(--pink-light) 100%);
    text-align: center;
}

.secret-message {
    padding: 25px 40px;
    background: white;
    border: 4px dashed var(--star-yellow);
    border-radius: 25px;
    cursor: pointer;
    transition: all 0.3s ease;
    animation: giftWiggle 2s ease infinite;
    max-width: 400px;
    margin: 0 auto;
    display: inline-block;
}

.secret-message:hover {
    background: var(--star-yellow);
    transform: scale(1.05);
}

.secret-message p {
    font-family: var(--font-cute);
    font-size: 20px;
    color: var(--text-dark);
    margin: 0;
}

/* ========================================
   漫画区域 - 可爱版
   ======================================== */
#comics {
    padding: 100px 20px;
    background: linear-gradient(180deg, var(--cream) 0%, var(--sky-light) 100%);
}

.comics-gallery {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 30px;
    max-width: 1200px;
    margin: 0 auto;
}

.comic-card {
    width: 280px;
    cursor: pointer;
    transition: all 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

.comic-card:hover {
    transform: translateY(-20px) rotate(3deg);
}

.comic-frame {
    background: white;
    border: 6px solid var(--sky-main);
    border-radius: 25px;
    padding: 12px;
    box-shadow: 
        0 10px 0 var(--sky-light),
        0 20px 40px rgba(91, 181, 197, 0.2);
    overflow: hidden;
    position: relative;
}

.comic-frame::before {
    content: '✨';
    position: absolute;
    top: 5px;
    right: 10px;
    font-size: 20px;
}

.comic-frame img {
    width: 100%;
    height: 340px;
    object-fit: cover;
    border-radius: 15px;
    transition: transform 0.3s ease;
}

.comic-card:hover .comic-frame img {
    transform: scale(1.05);
}

.comic-caption {
    text-align: center;
    margin-top: 15px;
}

.comic-caption p {
    font-family: var(--font-cute);
    font-size: 20px;
    color: var(--pink-heart);
}

.comics-note {
    text-align: center;
    margin-top: 40px;
    color: var(--text-medium);
    font-family: var(--font-cute);
    font-size: 16px;
    background: white;
    display: inline-block;
    padding: 10px 25px;
    border-radius: 20px;
    border: 3px dashed var(--pink-main);
}

/* 秘密消息动画 */
@keyframes giftWiggle {
    0%, 100% { transform: rotate(-2deg); }
    50% { transform: rotate(2deg); }
}

/* ========================================
   页脚 - 可爱版
   ======================================== */
footer {
    text-align: center;
    padding: 40px 20px;
    background: var(--pink-light);
    border-top: 5px solid white;
}

footer p {
    font-family: var(--font-cute);
    color: var(--text-dark);
    font-size: 16px;
}

.footer-date {
    margin-top: 8px;
    color: var(--pink-heart);
}

/* ========================================
   模态框 - 可爱版
   ======================================== */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(232, 244, 248, 0.95);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 10000;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.modal.active {
    display: flex;
    opacity: 1;
}

.modal-content {
    position: relative;
    max-width: 90%;
    max-height: 90%;
}

.modal-content img {
    max-width: 100%;
    max-height: 80vh;
    width: auto;
    height: auto;
    object-fit: contain;
    border-radius: 25px;
    border: 8px solid white;
    box-shadow: 0 20px 60px rgba(255, 107, 138, 0.3);
    background: linear-gradient(135deg, #FFE4E1 0%, #FFF0F5 100%);
}

/* 漫画查看器左右布局 */
.comic-viewer-content {
    max-width: 95%;
    max-height: 95vh;
    background: white;
    border-radius: 30px;
    padding: 30px;
    box-shadow: 0 25px 80px rgba(0, 0, 0, 0.2);
    overflow-y: auto;
    display: flex;
    flex-direction: column; /* 使用flex布局，让导航按钮在底部 */
}

.comic-viewer-layout {
    display: flex;
    gap: 30px;
    align-items: flex-start;
    margin-bottom: 20px; /* 为导航按钮留出空间 */
}

.comic-viewer-left {
    flex: 1;
    min-width: 0;
}

.comic-viewer-left {
    display: flex;
    justify-content: center;
    align-items: center;
}

.comic-viewer-left img {
    width: auto;
    max-width: 100%;
    max-height: 70vh;
    object-fit: contain;
    border-radius: 25px;
    border: 8px solid var(--pink-light);
    box-shadow: 0 20px 60px rgba(255, 107, 138, 0.3);
    background: white;
    margin: 0 auto; /* 左右居中 */
}

.comic-viewer-right {
    flex: 0 0 350px;
    background: linear-gradient(135deg, var(--pink-light), var(--sky-light));
    border-radius: 25px;
    padding: 25px;
    border: 6px solid white;
    box-shadow: 0 10px 30px rgba(91, 181, 197, 0.2);
}

.comic-photos-title {
    font-family: var(--font-cute);
    font-size: 24px;
    color: var(--pink-heart);
    text-align: center;
    margin: 0 0 20px 0;
    padding-bottom: 15px;
    border-bottom: 3px dashed var(--pink-main);
}

.comic-photos-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
}

.comic-photo-item {
    aspect-ratio: 1;
    border-radius: 15px;
    overflow: hidden;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 4px solid white;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.comic-photo-item:hover {
    transform: translateY(-5px) scale(1.05);
    box-shadow: 0 10px 25px rgba(255, 107, 138, 0.4);
    border-color: var(--pink-main);
}

.comic-photo-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 10px;
    border: none;
    box-shadow: none;
    max-height: none;
}

.no-photos-hint {
    grid-column: 1 / -1;
    text-align: center;
    font-family: var(--font-cute);
    font-size: 18px;
    color: var(--text-medium);
    padding: 40px 20px;
    background: white;
    border-radius: 15px;
    border: 3px dashed var(--pink-main);
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .comic-viewer-layout {
        flex-direction: column;
    }
    
    .comic-viewer-right {
        flex: 1;
        width: 100%;
    }
    
    .comic-photos-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    
    /* 平板优化 */
    .hero-content {
        padding: 0 30px;
    }
    
    .section-header {
        padding: 0 20px;
    }
}

@media (max-width: 768px) {
    .comic-photos-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .comic-viewer-content {
        padding: 20px;
    }
}

.close-btn {
    position: absolute;
    top: -50px;
    right: 0;
    font-size: 45px;
    color: var(--pink-heart);
    cursor: pointer;
    transition: all 0.3s ease;
    background: white;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
}

.close-btn:hover {
    background: var(--pink-heart);
    color: white;
    transform: rotate(90deg);
}

.viewer-nav {
    display: flex;
    justify-content: center;
    gap: 25px;
    margin-top: 0;
    margin-bottom: 0;
    padding-top: 20px;
    border-top: 2px dashed var(--pink-light); /* 添加分隔线 */
}

.nav-btn {
    background: white;
    border: 4px solid var(--pink-main);
    color: var(--pink-heart);
    padding: 12px 30px;
    border-radius: 30px;
    cursor: pointer;
    font-family: var(--font-cute);
    font-size: 16px;
    transition: all 0.3s ease;
    box-shadow: 0 4px 0 var(--pink-light);
}

.nav-btn:hover {
    background: var(--pink-main);
    color: white;
    transform: translateY(-3px);
}

/* 秘密弹窗 - 可爱版 */
.secret-content {
    background: white;
    border: 6px solid var(--star-yellow);
    border-radius: 40px;
    padding: 45px;
    max-width: 480px;
    text-align: center;
    position: relative;
    animation: popBounce 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    box-shadow: 0 15px 0 var(--moon-cream);
}

@keyframes popBounce {
    from {
        transform: scale(0.3) rotate(-10deg);
        opacity: 0;
    }
    to {
        transform: scale(1) rotate(0);
        opacity: 1;
    }
}

.secret-inner h2 {
    font-family: var(--font-cute);
    font-size: 32px;
    color: var(--pink-heart);
    margin-bottom: 25px;
}

.fireworks {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    overflow: hidden;
}

.secret-text {
    font-family: var(--font-cute);
    font-size: 22px;
    color: var(--text-dark);
    margin: 12px 0;
    opacity: 0;
    animation: popUp 0.6s ease forwards;
}

.secret-text:nth-child(2) { animation-delay: 0.2s; }
.secret-text:nth-child(3) { animation-delay: 0.4s; }
.secret-text:nth-child(4) { animation-delay: 0.6s; }
.secret-text:nth-child(5) { animation-delay: 0.8s; }

.secret-text.highlight {
    font-size: 30px;
    color: var(--pink-heart);
    background: var(--pink-light);
    padding: 8px 20px;
    border-radius: 20px;
    display: inline-block;
}

@keyframes popUp {
    from {
        opacity: 0;
        transform: translateY(20px) scale(0.8);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.love-meter {
    margin: 25px 0;
}

.love-meter p {
    color: var(--text-medium);
    margin-bottom: 10px;
    font-family: var(--font-cute);
}

.meter-bar {
    width: 100%;
    height: 25px;
    background: var(--sky-light);
    border-radius: 15px;
    overflow: hidden;
    border: 3px solid var(--pink-main);
}

.meter-fill {
    width: 0;
    height: 100%;
    background: linear-gradient(90deg, var(--pink-light), var(--pink-heart), var(--star-yellow));
    border-radius: 12px;
    animation: fillUp 2s ease forwards 1s;
}

@keyframes fillUp {
    to { width: 100%; }
}

.meter-text {
    color: var(--pink-heart);
    font-size: 22px;
    margin-top: 10px;
    font-family: var(--font-cute);
}

.close-secret-btn {
    background: linear-gradient(135deg, var(--pink-main), var(--pink-heart));
    border: none;
    color: white;
    padding: 18px 45px;
    border-radius: 35px;
    font-family: var(--font-cute);
    font-size: 22px;
    cursor: pointer;
    margin-top: 25px;
    transition: all 0.3s ease;
    box-shadow: 0 6px 0 var(--pink-deep);
}

.close-secret-btn:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 30px rgba(255, 107, 138, 0.4);
}

/* ========================================
   移动端导航菜单（汉堡菜单）
   ======================================== */
.mobile-menu-toggle {
    display: none;
    background: var(--pink-light);
    border: 3px solid var(--pink-main);
    color: var(--pink-heart);
    padding: 8px 12px;
    border-radius: 12px;
    cursor: pointer;
    font-size: 24px;
    transition: all 0.3s ease;
    position: absolute;
    left: 15px;
    z-index: 1001;
}

.mobile-menu-toggle:hover {
    background: var(--pink-main);
    color: white;
}

.mobile-menu-toggle.active {
    background: var(--pink-heart);
    color: white;
}

/* ========================================
   响应式设计
   ======================================== */
@media (max-width: 900px) {
    /* 幻灯片适配 */
    .photo-frame img {
        height: 400px;
    }
    
    .photo-caption-overlay {
        font-size: 16px;
        padding: 15px 20px 20px 20px;
    }
    
    .slideshow-controls {
        gap: 20px;
    }
    
    .control-btn {
        width: 50px;
        height: 50px;
        font-size: 20px;
    }
    
    .milestone-quick-nav {
        padding: 15px;
    }
    
    .milestone-btn {
        padding: 6px 14px;
        font-size: 13px;
    }
    
}

@media (max-width: 768px) {
    /* 移动端导航菜单 */
    .mobile-menu-toggle {
        display: block;
    }
    
    #navbar {
        padding: 10px 15px;
        flex-wrap: wrap;
        justify-content: space-between;
    }
    
    #navbar ul {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(10px);
        flex-direction: column;
        gap: 0;
        padding: 15px 0;
        border-top: 3px solid var(--pink-light);
        box-shadow: 0 4px 20px rgba(255, 182, 200, 0.3);
        z-index: 1000;
    }
    
    #navbar ul.active {
        display: flex;
    }
    
    #navbar .nav-link {
        font-size: 16px;
        padding: 12px 20px;
        width: 100%;
        text-align: center;
        border-radius: 0;
        border: none;
        border-bottom: 1px solid var(--pink-light);
    }
    
    #navbar .nav-link:last-child {
        border-bottom: none;
    }
    
    .music-btn {
        right: 15px;
        padding: 6px 12px;
        font-size: 18px;
        position: relative;
    }
    
    .envelope {
        width: 260px;
        height: 170px;
        margin-top: 15vh; /* 手机上更靠上 */
    }
    
    .letter {
        width: 500px;
        max-width: 90vw;
        max-height: calc(100vh - 350px); /* 确保不覆盖信封 */
        top: 50%; /* 始终在屏幕正中央 */
        transform: translateX(-50%) translateY(-50%); /* 居中显示 */
    }
    
    .letter.show {
        opacity: 1;
        pointer-events: auto;
    }
    
    .letter-content {
        padding: 25px 25px;
    }
    
    .letter-content h2 {
        font-size: 28px;
    }
    
    .letter-date {
        font-size: 15px;
        margin-bottom: 15px;
    }
    
    .letter-text {
        font-size: 17px;
        line-height: 2;
    }
    
    .letter-text .highlight {
        font-size: 32px;
    }
    
    .letter-text .love-declaration {
        font-size: 15px;
        padding: 8px 12px;
    }
    
    .letter-text .signature {
        font-size: 15px;
    }
    
    .title-line {
        font-size: 36px;
    }
    
    .badge-text {
        font-size: 38px;
    }
    
    .countdown-numbers {
        flex-wrap: wrap;
        gap: 10px;
    }
    
    .count-item {
        min-width: 70px;
        padding: 12px 15px;
    }
    
    .count-item span:first-child {
        font-size: 32px;
    }
    
    .holiday-wishes {
        flex-direction: column;
        align-items: center;
        gap: 15px;
    }
    
    /* 幻灯片 - 手机适配 */
    .photo-frame img {
        height: 300px;
    }
    
    .photo-caption-overlay {
        font-size: 14px;
        padding: 12px 15px 15px 15px;
    }
    
    .photo-decoration {
        font-size: 22px;
    }
    
    .day-badge {
        font-size: 18px;
        padding: 8px 20px;
    }
    
    #photo-message {
        font-size: 16px;
    }
    
    .thumbnail {
        width: 70px;
        height: 70px;
    }
    
    .floating-photo {
        width: 60px;
        height: 60px;
        display: none; /* 手机上隐藏浮动照片 */
    }
    
    .cute-dog {
        font-size: 35px;
    }
    
    .cute-dog.dog-1 {
        bottom: 10px;
        left: 10px;
    }
    
    .cute-dog.dog-2 {
        bottom: 10px;
        right: 10px;
    }
    
    /* 漫画查看器移动端优化 */
    .comic-viewer-content {
        max-width: 98%;
        max-height: 98vh;
        padding: 15px;
        margin: 10px;
        display: flex;
        flex-direction: column;
    }
    
    .comic-viewer-layout {
        flex-direction: column;
        gap: 15px;
        margin-bottom: 15px;
        flex: 1;
        overflow-y: auto;
    }
    
    .comic-viewer-left {
        width: 100%;
        order: 1;
        display: flex;
        justify-content: center;
        align-items: center;
    }
    
    .comic-viewer-left img {
        max-height: 50vh;
        width: auto;
        max-width: 100%;
        object-fit: contain;
        margin: 0 auto; /* 左右居中 */
    }
    
    .comic-viewer-right {
        flex: 1;
        width: 100%;
        max-width: 100%;
        order: 2;
        padding: 20px;
    }
    
    .viewer-nav {
        flex-direction: row;
        gap: 10px;
        justify-content: center;
        margin-top: auto; /* 自动推到底部 */
        padding-top: 15px;
        order: 999; /* 确保按钮在最下方 */
        flex-shrink: 0; /* 不收缩 */
        width: 100%; /* 确保按钮占满宽度 */
    }
    
    .nav-btn {
        flex: 1;
        max-width: 150px;
        padding: 12px 20px;
        font-size: 14px;
    }
    
    .comic-photos-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }
    
    .close-btn {
        top: 10px;
        right: 10px;
        width: 40px;
        height: 40px;
        font-size: 30px;
        background: rgba(255, 255, 255, 0.9);
        z-index: 10001;
    }
    
    /* 触摸优化 */
    .control-btn,
    .milestone-btn,
    .nav-btn,
    .autoplay-btn {
        min-height: 44px; /* iOS推荐的最小触摸目标 */
        min-width: 44px;
    }
}

@media (max-width: 550px) {
    .envelope {
        width: 220px;
        height: 150px;
        margin-top: 12vh; /* 小屏手机上更靠上 */
    }
    
    .letter {
        width: 400px;
        max-width: 92vw;
        max-height: calc(100vh - 350px); /* 确保不覆盖信封 */
        top: 50%; /* 始终在屏幕正中央 */
        transform: translateX(-50%) translateY(-50%); /* 居中显示 */
    }
    
    .letter.show {
        opacity: 1;
        pointer-events: auto;
    }
    
    .letter-content {
        padding: 20px 18px;
    }
    
    .letter-content h2 {
        font-size: 24px;
    }
    
    .letter-date {
        font-size: 14px;
    }
    
    .letter-text {
        font-size: 15px;
        line-height: 1.9;
    }
    
    .letter-text .highlight {
        font-size: 28px;
    }
    
    .letter-text .love-declaration {
        font-size: 14px;
    }
}

@media (max-width: 480px) {
    .title-line {
        font-size: 28px;
        letter-spacing: 3px;
    }
    
    .date-display {
        font-size: 22px;
        padding: 8px 20px;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .section-subtitle {
        font-size: 16px;
    }
    
    .comic-card {
        width: 100%;
        max-width: 280px;
    }
    
    /* 幻灯片 - 小手机适配 */
    .slideshow-controls {
        gap: 10px;
        flex-wrap: wrap;
    }
    
    .slideshow-info {
        width: 100%;
        order: 3;
        margin-top: 10px;
    }
    
    .control-btn {
        width: 50px;
        height: 50px;
        font-size: 20px;
        min-width: 50px;
        min-height: 50px;
    }
    
    #photo-counter {
        font-size: 16px;
    }
    
    .autoplay-btn {
        font-size: 13px;
        padding: 8px 16px;
        min-height: 36px;
    }
    
    .photo-frame {
        border-width: 5px;
        border-radius: 20px;
    }
    
    .photo-frame img {
        height: 250px;
    }
    
    .photo-caption-overlay {
        font-size: 12px;
        padding: 10px 12px 12px 12px;
    }
    
    .photo-decoration {
        font-size: 18px;
    }
    
    .milestone-quick-nav {
        padding: 12px;
        gap: 8px;
        flex-direction: column;
    }
    
    .nav-label {
        display: none;
    }
    
    .milestone-btn {
        padding: 8px 12px;
        font-size: 12px;
        min-height: 40px;
        width: 100%;
        max-width: 150px;
    }
    
    .thumbnail-strip {
        margin-top: 25px;
        padding: 15px 0;
    }
    
    .thumbnail {
        width: 60px;
        height: 60px;
        border-width: 3px;
    }
    
    .secret-content {
        padding: 25px 15px;
        margin: 0 10px;
        max-width: calc(100% - 20px);
    }
    
    /* 信封和信件小屏优化 */
    .envelope {
        width: 200px;
        height: 140px;
        margin-top: 10vh; /* 超小屏更靠上 */
    }
    
    .letter {
        width: 350px;
        max-width: 95vw;
        max-height: calc(100vh - 350px); /* 确保不覆盖信封 */
        top: 50%; /* 始终在屏幕正中央 */
        transform: translateX(-50%) translateY(-50%); /* 居中显示 */
    }
    
    .letter.show {
        opacity: 1;
        pointer-events: auto;
    }
    
    .envelope-container {
        bottom: 40px; /* 小屏幕上更靠近底部 */
    }
    
    .click-hint {
        margin-top: 20px;
        font-size: 14px;
    }
    
    .letter-content {
        padding: 20px 15px;
    }
    
    .letter-content h2 {
        font-size: 22px;
    }
    
    .letter-text {
        font-size: 14px;
        line-height: 1.8;
    }
    
    .letter-text .highlight {
        font-size: 26px;
    }
    
    .click-hint {
        font-size: 14px;
        margin-top: 20px;
    }
    
    /* 首页内容优化 */
    .hero-content {
        padding: 0 15px;
    }
    
    .count-item {
        min-width: 60px;
        padding: 10px 12px;
    }
    
    .count-item span:first-child {
        font-size: 28px;
    }
    
    .count-label {
        font-size: 12px;
    }
    
    .wish-card {
        padding: 15px 20px;
        width: 100%;
        max-width: 280px;
    }
    
    .wish-icon {
        font-size: 35px;
    }
    
    .wish-text {
        font-size: 18px;
    }
    
    /* 漫画查看器小屏优化 */
    .comic-viewer-content {
        padding: 10px;
        max-width: 100%;
        max-height: 100vh;
        margin: 0;
        border-radius: 20px;
        display: flex;
        flex-direction: column;
        height: 100vh; /* 确保占满视口高度 */
    }
    
    .comic-viewer-layout {
        gap: 10px;
        flex: 1;
        overflow-y: auto; /* 允许内容滚动 */
    }
    
    .comic-viewer-left {
        order: 1;
    }
    
    .comic-viewer-left {
        display: flex;
        justify-content: center;
        align-items: center;
    }
    
    .comic-viewer-left img {
        max-height: 45vh;
        width: auto;
        max-width: 100%;
        border-width: 4px;
        margin: 0 auto; /* 左右居中 */
    }
    
    .viewer-nav {
        order: 999; /* 确保按钮在最下方 */
        gap: 8px;
        margin-top: auto; /* 自动推到底部 */
        width: 100%; /* 确保按钮占满宽度 */
    }
    
    .nav-btn {
        padding: 10px 15px;
        font-size: 13px;
        max-width: 120px;
    }
    
    .comic-viewer-right {
        order: 2; /* 照片网格在按钮之前 */
        padding: 15px;
        border-width: 4px;
    }
    
    .comic-photos-title {
        font-size: 18px;
        margin-bottom: 15px;
        padding-bottom: 10px;
    }
    
    .comic-photos-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
    }
    
    .close-btn {
        top: 5px;
        right: 5px;
        width: 35px;
        height: 35px;
        font-size: 25px;
    }
}